Page 15 - 6_TOC in daily practice

Sum parameter – Total Organic Carbon

TOC-4200 -

Measurements up to 55,000mg/L TOC

SCA-130-608

TOC-process analyzers (TOC-4200) are used
in different applications from monitoring of
cooling water or condensate up to high
contaminated wastewater. For this, the TOC
analyzers have to provide a broad
measurement range.

■ ISP-Module in TOC-4200
The TOC-4200 achieves the broad
measurement range by using the dilution
function of the ISP-module (integrated ■ TOC-determination in the range of
sample pretreatment). 55,000mg/L

The recovery and repeatability in the high
measurement range is proven with a Glucose
solution.
Calibration
Parameter: TC
Catalyst: Standard
Std-Solution: 500mg/L (1-point)
Injection vol.: 20µl
#Injection Peak Area
1 768.6
2 784.2

3 762.1
Figure: ISP-module in TOC-4200 Mean value 771.6
RSD 1,47%
The ISP module consists of an 8-port valve
and a syringe with sparging gas connector. Glucose standard
Sample and dilution water is taken in the right Std-Solution: 55,000mg/L
ratio into the syringe. The solution is Dil. factor: 40
homogenized by sparging (over the sparge Injection vol.: 20µl
gas connector) with carrier gas. Port: Offline-Port
Dilution factors from 2 to 50 can be used. #Inj. Area Concentration Recovery
Normally the announced measurement range
of 20,000mg/L is sufficient for the controlling 1 2106 54,595 mg/L 99,3%
of wastewater. But in some application (e. g. 2 2137 55,399 mg/L 100,7%
99,2%
3
2104
54,543 mg/L
de-icing process on airports) measurement MW 2116 54,854 mg/L 99,7%
values up to 50,000mg/L are possible. SD 18,51 479 mg/L
RSD 0,87%